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I am pressing space, and i make the sound effect, but i don't jump. Any ideas?
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It's an issue with the game running at a high FPS, which itself is an issue with the DirectX 8 implementation on modern systems. Same thing happens with Manhunt. I recently added a section to PCGW about it, but basically, just add a D3D8 to D3D9 wrapper to the game's folder. This will make the game crash if you enable antialiasing in-game, though. Forcing it through your graphics card's control panel still works, though.
The wrapper I use is called d3d8to9 by Crosire, is available at the Reshade website, is open source, and is the one linked to in the PCGW article. There are others available as well, such as one at ENBDev.
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SkyNinja: It's an issue with the game running at a high FPS, which itself is an issue with the DirectX 8 implementation on modern systems. Same thing happens with Manhunt. I recently added a section to PCGW about it, but basically, just add a D3D8 to D3D9 wrapper to the game's folder. This will make the game crash if you enable antialiasing in-game, though. Forcing it through your graphics card's control panel still works, though.
The wrapper I use is called d3d8to9 by Crosire, is available at the Reshade website, is open source, and is the one linked to in the PCGW article. There are others available as well, such as one at ENBDev.
I used the latest dgVoodoo 2 (v2.54) as a D3D8-to-D3D11 wrapper (copied MS/D3D8.dll into the game directory). This fixed the physics issues. Also, anti-aliasing works! (I have all in-game graphical settings maxed-out). Though, there is an unfortunate side-effect: FMVs (such as the 'Rebellion' logo intro) are no longer visible.

I also used RiptoR's Custom Resolution Tool to adjust the aspect ratio and FOV settings to suit my monitor.

Tl;DR: the game itself appears to work perfectly on modern systems with the above fixes; breaks FMVs.
The only luck i have had with vanilla is to mash space a bunch. Sometimes it will happen on the first try, others, it can take 10 or more. Basically, i just save before and after every jump. They are basically achievements in themselves.
Post edited February 22, 2018 by Dogishappy
Playing it now (though Steam version) with the latest custom resolution tool version (0.3 or something) that I got linked from PCGaming Wiki.

Actually, unlike just about everyone else it seems, vsync is forced onto the game for me - even if I try to disable with drivers. It introduces a little input lag, so I actually used RivaTuner Statistics Server to cap the framerate to 59 - no more input lag.

RTSS can be used to cap framerate to any that you like, so it might fix this jump button issue some people seem to have.
Post edited March 21, 2018 by kalirion